Chart Agents will supply ENC data to vessels in coded form, in accordance with IHO-Standard S-63.
The standard defines code and decode modes for ENC products and the data supplier, and may be downloaded gratis from the IHO website. The code guarantees the authenticity and integrity of the data.
The data will be usually delivered on a CD-ROM.
Some Hydrographic Offices offer their data for direct download.
RENCs offer the possibility to download their ENCs directly via the Internet. To use this new feature an ESIG type approved ECDIS unit is essential.